×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Manipulating units for mass calculation

Manipulating units for mass calculation

Manipulating units for mass calculation

(OP)
Using ProE 2001

We have a set of models where the units were initially set to mmNs. At first we didn't want to calculate the mass and the models were ignorant of the material, the same models could be used for many materials.

Recently we have modelled some production tools where the materials were known and we hit a problem. When we tried to do a mass calculation the density requested had units of tonnes per cubic mm and returned the mass in tonnes.

I know that if we had set the units to mmKs the mass and density would have required kilograms not tonnes but now I need to adjust the model and I have two options:

1. I adjust the units in the model but this throws the related drawings out by a factor of 1000 and so I need a solution for the drawings as well.

2. I create a relationship and a subsequent variable for mass in kg, calculating the value from the mass in tonnes, and display this variable value on the drawing.

The problem I have:

1. I don't know how to get around the problem with the drawing rescaling its dimensions.

2. I don't know how to reference a data analysis value in a relation and create a variable and I don't know how to reference relation variables in drawing tables.

Can anyone help with either issue?

Cheers.

RE: Manipulating units for mass calculation

Fawkes,

Why not change the units in your parts to mm ,KG s (create a custom setting) and then reassign the materials (with density in your according units kg/mm^2) to your parts? This can be done yith a mapkey.


Forget the scaling and other tricks. Yes it can be done, buth those are IT tricks. We are mechanical engineers.

-Hora

RE: Manipulating units for mass calculation

(OP)
When I first looked at your answer I didn't get it and then I thought I'd take a look at the units in ProE and it dawned on me what a plank I am.

The reason I'm getting dimensions changing by a factor of 1000 is because MKS is metres not millimetres, I hadn't realised this.

Seems a bit daft that you kg with m and tonne with mm but hey, I'll create my own custom units.

Cheers.

RE: Manipulating units for mass calculation

Yep, custom units is the key. Good luck. Don't forget to set the correct density in each material file!

-Hora

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources